Displaceable die holder for power press



April 7, 1959 c DISPLACEABLE DIE HOLDER FOR POWER PRESS Filed June 9,1954 g Q S INVENTOP KA K544 2,880,867 DISPLACEABLE DIE HOLDER FOR POWERPRES Karl Keck, Goppingen, Germany, assignor to L. Schuler A.G.,Goppingen, Wurttemberg, Germany Application June 9, 1954, Serial No.435,548

' Claims priority, application Germany June 16, 1953 6 Claims. (Cl.2071) This invention relates to power presses for the manufacture oftubular articles.

An object of the present invention is to provide means facilitating moreeconomical and eflicient operation of a press and ready and rapidassembly thereof, said object being accomplished by a slidably disposeddie or matrix holder which cooperates with levers and pusher elementsthat mechanically change dies when said holder occupies a prescribedposition to one side of its normal operative position.

It is another object'of the invention to provide means rendering thepossibility of easily and efiicaciously interchanging the die in anextrusion or like power press in particular after such die has beensubjected to appreciable wear, or has become inoperative on account ofcrust deposits or deformations.

It is still a further object of the invention to provide means ensuringready access to the die holder after the same has been slidablydisplaced for the purpose of adjusting the die, and of effectuating thedie assembly to provide further means conducive to accurate automaticregistry of the die in the die holder of the press.

Yet a further object of the invention resides in the provision of meansaffording positive feeding of the die to the die holder by hydraulic orpneumatic pressure means passing through die feeding means.

Still another object of the invention is to provide means enabling rapidand safe assembly of a die with a die holder during operation of thepress, in which another die and die holder are in operative position.

These and other objects, features and advantages of the invention willbecome apparent from the ensuing description and drawing which is merelyexemplary.

In the drawing:

Fig. 1 is a fragmentary, elevational view, partly in section, of a tableof a tube extrusion press equipped with two slidably disposed dieholders, one of which being shown inoperative position and the other ofwhich in the process. of receiving a die;

Fig. 2 is a top plan view of Fig. 1, certain parts being shown insection and die feeding means being shown in two different positions.

Referring now to Fig. 1, there is shown a table 22 of a tube extrusionpress having a plunger 21 with a mandrel portion 16 connected thereto.Table 22 is provided with a pressure plate 90 having a central bore 91which communicates with a conical opening 92 provided in the body of thepress 1. A slide 44 is movable in lateral guides 93 in table 22. Saidslide 44 may be reciprocated by a pneumaticor hydraulic-actuated pistonrod 94 which is connected to a piston (not shown) and movable incylinder 59. Slide 44 is provided with two large openings or apertures96 in each of which is firmly at fixed by means of a respective ringmember 97 a die hold er 23. The extent of movement of slide 44 isdefined or limited through suitable abutment pieces 45 and 46 suitablydisposed in the path of movement of slide 44 as may be clearly seen fromFig. 2.

To this end, slide 44 is provided with opposite abutment pieces forcooperation with abutments 45 and 46 so that if one die holder is in itsoperative position below the plunger 21 the other die holder is in itsin operative position for receiving a new die. The slidable die holder23 is further provided with a central bore 98 which is somewhat largerthan bore 91 of the pressure plate 90. Bore 98 is further constructed tofittingly receive the die or matrix 24.

In table 22 are provided passageways 99 which are disposed to coincideor to be in registry with a central bore 98 of a respective die holderafter the same is moved together with the slide 44 beyond the plunger 21into extreme positions, as it is quite apparent from Figs. 1 and 2.

At opposite ends of the table and in the table there are providedelongated cut-out openings 100 which are laterally accessible as may bevisualized from Fig. 1. In each of these cut-out openings 100 there ispivotally swingable about a vertical stud or pin 104, a feed lever inthe form of an angle lever having arms 102 and 103. Lever arm 102 iscambered or bent at an angle and enlarged at an extremity 101. Thisextremity 101 projects in its outwardly swung position beyond theconfines of the table 22 and possesses a recess for the reception of apress die 24. Recess 105 communicates with a central hole 106. Whendouble-arm lever 102, 103 is swung into the press, it will be observedthat passageway 99 coincides or is in registry with recess 105 and hole106. A'

vertically movable pin or pusher element 107 is disposed belowpassageway 99 and is displaceable relative to the latter by means of afixedly arranged piston 108 cooperating with cylinder 109 to which thelower end of pusher element 107 is connected.

With cylinder 109 a conduit 110 is connected which in turn communicateswith an air compressor reservoir or receptacle (not shown) containingliquid or fluid under pressure. The free end of pivoted lever arm 103 isoperatively connected to a piston rod 111 which carries a piston 112which is driven either pneumatically or hydraulically in a cylinder 114,the latter being pivotally disposed at 113 as it is more clearlyapparent from Fig. 2.

Feed lever 102, 103 and pusher element 107 form means or a device forthe insertion of a press die 24 to be received in die holder 23.

The press die 24 as seen in the center of Fig. 1, is in registry withmandrel 16 and in operative position with the latter. If a press die isto be removed or interchanged, the displaced right hand die holder 23may be loaded or fitted with a press die (not shown). It will be readilyrealized that if the die holder 23 is in a displaced position and feedlever 102, 103 is swung toward the press, the die 24 will first beremoved by means of a hammer and chisel, so that the used die 24 fallsthrough passageway 99 into recess 105 of lever arm 101.

r This feed lever is subsequently outwardly swung by means of thepneumatically or hydraulically operated piston 112 (as seen on theleft-hand side of Fig. 2 partly in dicated in full lines) and theused-up or worn die will be discarded and a new press die is insertedinto recess 105 whereupon the feed lever 102, 103 is again swung intofeed position (as seen on the right-hand side of Fig. 2 and indicated indot and dash lines).

As soon as lever arm 101 is again positioned below passageway 99 andbore 98, pusher element 107 is moved upwardly under the pressure ofcompressed air or hydraulically, whereby said element 107 enters hole106 of recess 105 and moves a new press die 24 (not shown) into bore 98,as will be readily understood. Pusher element 107 remains in its restposition but in such manner its end face comes to lie flush with thetable until the press die is to be again exchanged or replaced.

Feed means 102, 103, 107 facilitate removal and in- 44. Such feed meansfor a new die are operable below the bore 98 of the respective dieholder in its displaced position (as seen on the right hand side of Fig.1).

Instead of theslide with two die holders adrum-shaped device withseveral die holders may be employed, for which feed means may besuitably disposed together with a device for ejecting or pushingout anold and used-up die.

The invention further contemplates means for automatically controllingthe oscillatory movements of the feed levers and the rising or verticalmovements of pusher 107 which is employed to facilitate insertion of anew die.

It is apparent that various changes may be made in the detailsofconstruction and that various combinations of the features thereof canbe used without departing from the spirit of the invention except asdefined in the appended claims.

Having thus described the invention, what is claimed as new and desiredto be secured by Letters Patent, is:

1. A power press of the character described comprising a plurality ofdie holder means arranged for slidable displacement from and to themandrel of the press, each die holder means being provided with acentral bore, a fixed support for said die holder means and providedwith a central opening and further provided with elongated cut-outopenings at either side of and spaced from said central opening of saidsupport, passageways in said support and communicating with said cut-outopenings, respectively, feed means in said cut-out openings and movablein registry with said passageways, respectively, and pusher means belowsaid support and movable into said respective passageways and forregistry with the central bore of one of said die holder means when thesame is displaced for registry of its central bore with thecorresponding passageway, whereby upon insertion of a die in said feedmeans and subsequent movement of the latter into registry with saidcorresponding passageway of said support said pusher means will presssaid die through said passageway into said central bore of said one dieholder means.

2. A power press having a mandrel for cooperation with a die, comprisinga plurality of die holder means arranged for slidable displacement fromand to the mandrel of the press, each die holder means being providedwith a central bore for receiving therein a die, a fixed support, forcarrying said die holder means during displacement, said support beingprovided With lateral and elongated cut-out openings spaced from thecenter of said support, passageways in said support and communicatingwith said cut-out openings, respectively, power-actuated feed means'insaid cut-out openings and movable in registry with said passagewaysrespectively, and power-operated pusher means below said support andmovable into respective passageways and for registry with the centralbore of one of said die holder means when the same is displaced forregistry of its central bore with the respective passageway of saidsupport, whereby upon insertion ofa die in said feed'means' andsubsequent movement of the latter into registry with the respectivepassageway said pusher means'win press said die through said passagewayinto said central bore of saidone die holder means.

3. A power press according to claim 2, said feed means including pivotedtwo-armed lever means, and means adapted to swing said lever means toand fro the respective passageway for receiving and discharging a diefrom said lever means;-respectively.

4. A power press according to claim 3, said lever means being providedwith a recess corresponding to the size of said die, said recess beingfurther provided with a hole through which said pusher means will beguided for moving said die from said lever means into said central boreof said one die holder means.

5. A power press-according to" claim 2, including power-actuated means,and means connecting said poweractuated means with said die holder meansfor moving the same froma central position on said support in which saidbore of one of said die holder means is in registry with a centralopening provided in the center of said support to a position remote fromsaid central opening in which said bore of said one die holder means isin registrywith thecorresponding passageway for removing a used up diefrom said one die holder means into the corresponding passageway and fortransfer to the corresponding lever means.

6. In a power press; die holder supporting means, a plurality of dieholders arranged on said die holder supporting means and for removaltherefrom, said die holder supporting means being movable from anoperative position to an inoperative position, each die holder beingprovided with a bore, die member receiving means arranged for movementat right angles to the respective bore of one of said die holders whenthe latter is in said inoperative position, and operable means arrangedfor movement in the direction of the axis of said respective bore and inregistry with said die member receivingmeans, so that a die member whenplaced in said die member receiving means may be moved by said operablemeans into the respective bore of one of said die holders for positiontherein, while another of said die members assumes an operative positionand is carried by its die holder in the bore thereof for cooperationwith a mandrel.

References Cited in the file of this patent UNITED STATES PATENTSGermany Jan. 19, 1932

